Screw-conveyer



(No Model.)

H. W. OA,LDWELL.

Screw Gonveyer.

No. 235,619 Patented Dec. 21,1880.

B B E B 52 E EE N.PEIERS, PHOTO-UTHOGRAPMEH, WASHXNGTON. n c.

lJNiTED STATES PATENT OFFI E,

HENRY W. CALDWELL, OF ST. LOUIS, MISSOURI.

SCREW-CONVEYER.

SPECIFICATION formingpart of Letters Patent No. 235,619, dated December21, 1880.

Application filed November 18; 1880. (No model.)

To all whom it may concern:

Be it known that I, HENRY W. CALDWELL, of the city of St. Louis, in theState of Missouri, have invented a certain new and useful Improvement inScrew-Oonveyers, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

My improvement relates to the coupling by which the sections of atubular conveyershaft are connected together at the point of bearing;and it consists in the combination, with said sections or lengths ofshaft, of a cylindrical plug which itself forms the journal of the shaftat that point, (extending through the hanger-box,) the ends of thesections being reenforced by aferrule. Bolts pass through thetube-sections and the coupling-plug.

In the drawings, Figure 1 is a side elevation of the invention. Fig.2isalongitudinal section, with the greater part of the coupling-journal inside View. Fig. 3 is a section at :10 00, Fig. 2. Fig. 4 is a section ata0 :12, Fig. 2.

A A are parts of .two similar sections or lengths of a screw-conveyer,upon which are spiral flights B. The ends of the sections A arere-enforced by collars O, that are welded to the tubes, so as toincrease their strength at that point.

D is the coupling-bar or mandrel, which have two bolts in each tube-section at the coupling,thebolts being placed at right angles to eachother.

The central part of the mandrel D forms the journal of the shaft A A,and has bearing in the box F of the hanger F. I prefer to insert betweenthe bolt-lugs F of the hanger-box shims f, of wood or paper, which willallow a small amount of latitude to the movement of drel D is made tofit easily in the tube-sections A, and the bolt-holes in the mandrel arebored of a size to allow the bolts to pass through easily.

In manufacturing, my coupling journals or mandrels (all of one size) aremade of similar pattern, and the sh aft-sections are all similarlybored, so that they are interchangeable.

I claim 1. The combination of sections A A, coupling-mandrel D, forminga shaft-journal, bolts E, and hanger F, for the purpose set forth.

2. The combination, with the hangerF and shaftsections A A, of themandrel D, freely fitting the interior of the sections A, and bolts E,passing through the sections and loosely through the mandrel.

HENRY W. CALDWELL.

Witnesses:

SAML. KNIGHT, GEO. H. KNIGHT.

